FB Performance's HP claims as well as the 4STB's gear ratios are similar to the 4L80 transmission. Overall cost of either tranny is about the same when you figure in the converter, crossmember, driveshaft, ect. What caught my attention is that the 4STB has an electrically operated OD. Unlike a 4L80 which must be manually shifted in & out of OD. That would mean more shifter choices (3 spd vs. 4 spd) when using the 4STB. It also can also be ordered with a traditional Pontiac bellhousing pattern. No need for a transmission adapter like the 4L80. The 4STB is supposed to be a bit lighter too.
For me it all comes down to durability. The 4L80 is a tough tranny to beat! I'd like to hear some input/info from someone that has actually used the 4STB. Not just claims from it's manufacturer.
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1967 FIREBIRD Street Car Days: 406 cid = 11:46 ET 
http://www.spottsperformance.com/ima...lyPowell67.JPG
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